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Hardcore! It’s so impressive to see a system of that size and age up and running. What are the power requirements? 208 three phase? That may be a big advantage of where your located being you can get three phase.

Cool, where did you put the motor generator being it’s huge, heavy and loud? The one or two mechanical converters I have dealt with for 400 cycles in the past would drive you from the room after a while. Have seen where people bought surplus 400 Hz diesel generators and brought distribution into the room and provided three phase “military” power that way.

It's not huge and not that loud. Remember all it does it convert one kind of electricity into another kind of electricity -- it's not a "generator" in the fuel-powered sense. For now we just tuck it away in a corner. We will only run the computer for special events, not a regular basis like a Commodore.

Good quality motor/generator sets are typically pretty quiet, the 400 Hz side usually just has more poles, so the rotational speed doesn't need to be that high. A large industrial motor, even a single phase one, is in no way comparable to consumer grade stuff you'd typically find in e.g. table saws -- startup and run is more of a "loaded transformer buzz" and then a hiss. Here's an old induction start Janette motor I've got coming up and running:

...that one is mechanical start, with an out-of-phase winding and centrifugal switch, so one of the noisier starting arrangements. It also has plain bearings (hole in bronze that the steel shaft rides in).